Welcome to HCM.
You had previous missed abortion
of 10 wk and now trying for baby.
If D & C or other surgical intervention was done previously,then possibility of pregnancy
declines as compare to who has not done anything. It is probably due to scarring of endometrium or unhealthy environment for implantation
caused by endometritis
or anything else.
So do a fresh USG scan for pelvis and some hormone study.You may need to do hysteroscopy
to rule out uterine pathology. Need to do tubal patency test if there is tubal blockage caused by ascending infection.
So consult with your gynecologist and take advice accordingly with relevant test reports.
Avoid stress,take healthy diet,do light exercise and proper sleep.